Before exporting, you should know why the publication uses halftone screens and color separation. Because the printer has two limitations: - The printer can only print a solid color and can not print color - The printer can only be on the paper at a time Use a color ink. The successful printing of publications will be determined by two factors. Because printing is an image that contains a hue (called a continuous tone image). The printer only prints solid colors. To solve this problem involves using small dots to create a simulated hue image. These images are called halftone images. The second problem involves printing images of multiple colors on a printer that applies only one color of ink at a time. Each ink must be applied independently, so the image must be separated into its basic hue by creating color separations. 2. What is a halftone image? Halftone images consist of dots. Images containing tones must be converted to halftone images before printing. 3. Why can't the printing machine print the color tone? When an image is transferred onto a stencil printing plate, the image area (the printing plate section that transfers the ink to the page) is chemically treated to absorb ink and repel water. The non-image areas are treated to absorb water and repel ink when the ink passes through the printing plate. The ink is only attached to the image area. When the printing plate comes into contact with the paper, only the part of the page that is in contact with the image area is printed with ink. The disadvantage is that there is a lack of gradation. Solution: Create an illusion tone by printing an image of small dots. Then, how can we convert an image that contains a hue or a continuous-tone image into an image that consists of small dots. This process is called a halftone screen. What is the screen number and screen angle? Holes in the halftone screen are arranged in rows. The number of rows per hole in the halftone screen determines the number of lines that make up the halftone image. This value is called the screen line number. Expressed in lines per inch (LIP). If the halftone screen has the same angle, then the printed material has a distinct pattern. All of the color separations must have different angles. V. What is digital halftone? Halftone images are created using small dots called pixels. If each row of halftone dots consists of some small pixels. Each set of pixels forming a halftone dot is called a halftone cell. 6. Maximum Screen Lines and Dot Gain? Higher screen lines contain all of the halftone dots of the resulting image; the smaller halftone dots will produce sharper details with more detail. image. However, there is a limit to the number of screen lines that can be used depending on the amount of point gain that is expected to occur. When printing a publication on a printing press, the ink spreads slightly as it is absorbed by the paper. Diffusion of the ink contains a large half-tone point and the image looks deeper than expected. This effect is called dot gain. Using appropriate electronic color management or highlighting of the image can compensate for point gains or use paper that does not absorb ink well. Use accurate presses to increase the maximum number of screens.
Slit Film
Shantou Jinping Sunny Machinery Factory , http://www.nsslittingmachine.com